Glossary for Performance Testing Guidance for Web Applications

Latency Server latency is the time the server takes to complete the execution of a request. Server latency does not include network latency. Network latency is the additional time that it takes for a request and a response to cross a network. Client
latency is the time that it takes for a request to reach a server and for the response to travel back.

Metrics Metrics are the actual measurements obtained by running performance tests. These performance tests include system-related metrics such as CPU, memory, disk I/O, network I/O, and resource utilization levels. The performance tests also include
application-specific metrics such as performance counters and timing data.

Performance budgets Performance budgets are your constraints. Performance budgets specify the amount of resources that you can use for specific scenarios and operations and still be successful.